html
  font-family: -apple-system,BlinkMacSystemFont,Helvetica Neue,PingFang SC,Microsoft YaHei,Source Han Sans SC,Noto Sans CJK SC,WenQuanYi Micro Hei,sans-serif;
  font-size: 16px;

html,body
  height: 100%

body
  background #2E2E2E
  /* Firefox scrollbar*/
  scrollbar-width: thin;
  scrollbar-color: #2E2E2E #DDDDDD;

::-webkit-scrollbar-track
  border 1px solid $key_color_border
  border-radius: 3px
  background-color: #DDDDDD

::-webkit-scrollbar
  width: 8px
  height: 8px

::-webkit-scrollbar-thumb
  background-color: #2E2E2E
  border-radius: 3px
  &:hover
    background-color lighten(#333, 20)

